403921 has 8 divisors (see below), whose sum is σ = 486080. Its totient is φ = 327888.

The previous prime is 403901. The next prime is 403933. The reversal of 403921 is 129304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 403921 - 2⁵ = 403889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (403901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1386 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (60760).

2⁴⁰³⁹²¹ is an apocalyptic number.

It is an amenable number.

403921 is a deficient number, since it is larger than the sum of its proper divisors (82159).

403921 is a wasteful number, since it uses less digits than its factorization.

403921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 403921 is about 635.5477952129. The cubic root of 403921 is about 73.9205990321.

The spelling of 403921 in words is "four hundred three thousand, nine hundred twenty-one".